Czech mortgage refinancing: when it pays off and what it costs

A borrower in Prague who reads that rates have fallen may wonder whether to switch their mortgage. The answer comes from arithmetic, not from the news. A lower rate saves money each month, and a switch costs money once. The task is to find the date on which the first overtakes the second, and to ask whether you will still hold the loan on that date.

This explainer sets out the logic, the costs and the points in the contract and the law to check. It gives no personal advice, and it quotes no rates, since they change often.

What refinancing is

In a refinancing, a new lender, or your current one, grants a new loan, and the proceeds repay the old one. The lien on your flat in the cadastre is replaced. In Czechia the term covers several variations.

• Switching banks (refinancování). A new bank repays your old loan and takes over as lender.
• Renegotiating with your current bank. The bank offers a better rate or a new product, often at the end of a fixation, without a change of lender.
• Taking a larger loan. Refinancing combined with extra borrowing, which raises separate questions and is not covered here.

The Hypoteky.com guide to refinancing gives an overview of the process from a broker's viewpoint.

The break-even logic

A simple way to think about it uses four inputs.

1. The saving per month. The difference between your current payment and the new payment, for the same remaining balance and term.
2. The one-off costs. Fees for the new loan, a new valuation, the cadastre fee for the new lien, legal costs, and any charge for repaying the old loan early.
3. The break-even point. One-off costs divided by the monthly saving gives the number of months before the switch has paid for itself.
4. Your time horizon. If you expect to sell, repay or refinance again before the break-even point, the switch does not pay.

The arithmetic is plain. Take a hypothetical borrower whose one-off costs equal ten months of the saving: the switch pays for itself in the eleventh month, and every month after that is gain. A borrower who expects to keep the loan well beyond that point comes out ahead. One who plans to sell or repay before it does not. Your own quotes supply the real figures.

The cost list

Ask the new bank and your current one for each of these in writing.

• Early-repayment charge on the old loan. Under the consumer credit act (zákon č. 257/2016 Sb.), repayment at the end of a fixation is free. In the middle of one, the old lender may claim only its reasonably incurred costs, which for a housing loan cannot exceed 1 per cent of the amount repaid (as of 2026; check your contract and ČNB). The free cases for a sale do not cover a switch to another bank.
• Fees for the new loan. Arrangement, administration and valuation fees.
• Cadastre fee and legal costs. Registering the new lien is a cadastre application with a CZK 2,000 fee (as of 2026; check ČÚZK), and the old lien has to be deleted. Some banks refund these costs to win the loan; ask.
• Insurance. A new lender may require its own property insurance.
• Time and paperwork. Not a cash cost, but a real one.

The best moment to switch

The cheapest time is the end of a fixation. Start about six months before: ask your current bank for its renewal offer, and ask two or three other lenders or a broker for quotes on the same loan. Use the offers to negotiate. Many borrowers stay with their bank after getting a better rate by showing a competing quote, and that saves the fees of a full switch. Our explainer on fixation periods sets out what happens at the end.

Switching in the middle of a fixation is possible, but the early-repayment terms must be checked. If a charge applies, it can wipe out the saving. Only the numbers for your contract can tell you.

What the new bank will check

The new lender treats you as a new borrower. It assesses your income, your obligations, the value of the flat and your credit record. The central bank's loan-to-value ceiling (80 per cent, or 90 per cent for applicants under 36, as of 2026; check ČNB) applies to new loans, so a plain refinancing of the existing balance usually clears it easily, while a switch that adds new borrowing is tested against it. If the flat has lost value, the new bank may offer a smaller share. Our explainer on the deposit and LTV shows how LTV works.

A borrower with a good record and a fall in the balance is often in a better position than at the start. A borrower whose income has fallen or who has taken on other debt may be in a worse one. A bank's view is therefore part of the decision, and it comes with a fresh valuation and a fresh application.

Foreign borrowers

If you are a foreign borrower, your status may have changed since you took the loan, for better or worse: a longer residence permit, a longer record of Czech income or a move abroad. All of these affect refinancing. See our explainers on mortgages for foreigners and non-resident mortgages.

Market context

When the ČNB changes its policy rate or market rates move, offers change, but with a lag and with differences between banks. The ČNB publishes interest-rate statistics, and the Czech mortgage market in numbers on Hypoteky.com gives a secondary overview. Always check the date on the data you use. Our explainer on what sets Czech mortgage rates describes the layers.

Frequently asked questions

Frequently asked questions

How do I know whether refinancing is worth it?

Add up all one-off costs, divide by the monthly saving to find the break-even in months, and compare it with the time you expect to keep the loan.

When is refinancing cheapest?

At the end of a fixation, when repaying the old loan is free under zákon č. 257/2016 Sb. (as of 2026; check ČNB).

Can I negotiate with my current bank instead?

Yes. Many banks improve their offer when a borrower presents a competing quote, and this avoids the costs of a full switch.

Does the new bank value the flat again?

Usually yes, and the new valuation sets the loan-to-value on which the new rate is based.

Common traps

A few features make an offer look better than it is.

• A lower payment from a longer term. Stretching the term lowers the monthly payment while raising the total interest. Compare the total cost, not just the instalment.
• A teaser rate bundled with products. A rate that depends on an account, insurance or a card is worth only what the bundle costs. Ask what happens to the rate if you drop a product.
• Ignoring the old bank's charges. The early-repayment charge on the old loan is a real cost, even if the new bank advertises "no fees".
• Forgetting the lien. A new loan needs a new lien in the cadastre and the deletion of the old one, with a timetable that both banks must agree. A gap between payoff and the new lien is a risk to discuss with the banks.
• Counting only the rate. Compare the RPSN, which includes certain fees.

Timetable

The periods are indicative. Banks have their own lead times, so ask each one.

A first step

Find your contract, note the fixation end date and the early-repayment terms, and ask your bank for the payoff figure. If you are thinking of selling instead, compare with selling a flat with a mortgage. Then request one quote from another lender on the same loan. The two sheets, side by side, answer the question of whether it pays.

This is a general explainer, not legal, tax or mortgage advice.